Hi Anfooshi,
There are quite a lot of options but it is likely that you are going to have to get a few more years experience in a school environment plus some kind of teaching qualification to get to the better schools in Indonesia. I think the market is tough right now, but if you have the money to drop, the most sensible thing to do would be to get a state teacher's license if you are an American citizen (see:
https://www.moreland.edu/; and,
https://www.teacherready.org/).
Another option would be to get an 'iPGCE' which is the academic aspect of a UK qualification for teaching in schools. The downside to this is that it doesn't qualify you to teach in schools because it doesn't carry the QTS stamp from the UK government to teach in the UK state system. I have this qualification from the University of Derby in combination with an MA TESOL and about eleven years experience. Nottingham, Sheffield, Warwick, Sunderland, Teeside, Leeds Beckett, Cumbria and Strathclyde all have similar courses to my knowledge. The best courses are the Sunderland and Warwick ones because they have a practical component. Buckingham also have a couple of affordable master's programs for about 5-6,000 GBP that look quite good and can be studied online. The iPGCE at Derby could be done for about 2,650 GBP and then the master's component on top after the academic credit from the iPGCE would set you back about another 5,000 GBP. For less than 8k GBP you would get two certs.
Another interesting course that has popped up in the last few years is the MEd in advanced teaching from the University of the People (See:
https://www.uopeople.edu/programs/master-of-education-med/). This course is recommended by the IB and has a 'tuition-free' status where you just pay exam fees. So, all in all, would set you back a couple of thousand USD.
If you are working in a language school now, I would recommend trying to get into an organization like Penabur or Indogro. These take teachers from language school backgrounds and place them in schools on a part-time basis. After a year or two working for an organization like that, you should be able to transfer into a full-time school position. The Japanese school, the Taipei school and the Korean school pay well and would be the next logical step as they operate second language curricula. Once you have five years experience at these types of institutions, you wouldn't have problems finding employment in relatively well-paying schools, I don't think. There is always the possibility that friends in other schools might be able to get you an interview before the five year mark or that you get an interview at a mid-level school in the interim.
For reference and based on some information available on jobsites like Search Associates, ISS Schrole and Teacher Horizons there are sort of three tiers based on pay:
Lower-tier: Jakarta Multicultural School; Mentari International School; Jubilee School; Bunda Mulia etc.
Mid-tier: Singapore International School; Bina Bangsa; Binus Serpong; Jakarta Nanyang; Sekolah Victory Plus; Beacon Academy; Tunas Muda, National High etc.
Upper-tier: ACG; AIS; Sampoerna; ACS; Binus Simprug; Global Jaya; JIS; BSJ, NJIS, SWA.
There are lots of schools that I can't think of off the top of my head, but a good thing to bear in mind is this. All of these schools have either a Cambridge International or an IB curriculum. Among these schools, the experience that you gain will be transferable if you pick up the curriculum training for the requisite curriculum. The Korean school for example pays more than a lot of the 'Mid-tier' schools that I have described there but the experience is largely not transferable because it uses a second language curriculum.
In some cases, pay scales are opaque and you have to negotiate with the school to get a deal that you are happy with. I don't believe that this is the case with the Western schools.
Hope that helps,
Lee
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