Why does my website ranking appear and disappear?

StickeyNote said:

Does programming language affect ranking? is it better to use PHP programming language with Laravel Framework or Angular?

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Programming languages usually do not affect SEO directly. Search Engines use different methods for ranking, such as Page Speed, UI?UX, Content quality, backlinks, structured data etc.
Laravel is a great framework for SEO as it supports server-side rendering but you can face some issues with Angular as it supports Client-Side rendering and crawlers often see a blank page.
If you want to go with Angular so you need to implement Server-Side-Rendering by using Angular Universal.

Website ranking can fluctuate du to Google updates, competition, poor content, backlinks, technical issues,
or if the site is new.

rankings can fluctuate due to algorithm updates, competition, or indexing issues. make sure your site has fresh content, good SEO, and check for any penalties.