Fix Random WordPress Crashes

My WordPress site has started going down without warning. The crashes happen randomly and I already suspect plugin conflicts are part of the problem, but I need a clear diagnosis and a solid fix. Here’s what I know so far • The site crashes randomly rather than during updates or traffic spikes... (Budget: $20 - $50 USD, Jobs: CSS, Debugging, HTML, PHP, Web Development, Website Management, Website Optimization, WordPress)