use sites like these to get ideas:
https://www.namebounce.com/
https://namechk.com/
and experiment with various suffixes and prefixes until you find something you like.
A few words of caution, though...
1) when you find a name that you like do NOT type it into the domain name lookup fields of hosters like Godaddy, Namecheap, etc as these fuckers up the price of the domain and they'll try to sell it to you at premium.
A domain that should cost you no more than $15 per year will be offered to you by Godaddy, for example, at $200 or more. You need to find alternative ways of checking for the domain's availability or else you risk not being able to register the domain at standard price with the registrar you want...
2) do NOT use trademarked terms, or words that could be trademarked (sony, apple, etc...). You wouldn't believe the amount of people registering the "perfect" domain (maclaptops.com for example, which is literally just an example, I don't know whether anyone other than Apple owns this domain name) only to receive a takedown notice from Apple lawyers months later asking you to pull the domain off the internet and stop making money off Apple's brand.
Do not fall for this trap, only register domains that contain broad terms like tech, PC, app, etc...
3) not very important, but still worth mentioning: if the .com version of your domain is not available but other, more obscure / unpopular versions are, do not be afraid to choose those TLDs instead! We are moving away from rigid mentalities that business people usually have and most people nowadays are not as fussy about fake professionalism as they once were. There are lots of .io, .co, .tech, etc domains online that are as good as .com ones, so choose one of these less popular extensions if the usual suspects (com, net, org, info) are unavailable...
PS: if you want, you can send me details via PM about what you're looking for and what your site / business is about and I might be able to find a good domain for you, I used to like coming up with great domain names in the past, so I wouldn't mind a bit of exercise for the sake of good 'ol times
