How do i get to the top of google without a big budget?

Pick smaller fights. On a small budget you won't beat big sites for the head term, so go after the longer, more specific searches where the results are weak - forum threads, old posts, thin pages ranking. Write the best page for that exact question. Then fix the basics you control for free: titles that match the search, pages that load fast, internal links from your strongest pages to the new ones. If you're local, a complete Google Business Profile will get you seen faster than anything else.