If the domain name you want isn't available for your blog niche, here are some steps you can take:
Consider using a different top-level domain (TLD): Instead of a .com domain, you can consider using a different TLD like .net, .org, or a country-specific domain extension like .co.uk, .ca, etc. This may help you find an available domain name that still fits your blog niche.
Use a domain name generator: You can use a domain name generator tool that can suggest alternative domain names based on your blog niche and other keywords.
Modify the domain name slightly: Consider tweaking the domain name slightly by adding or removing words or changing the order of words. For example, if "foodblog.com" is taken, you can try "myfoodblog.com" or "foodblogcentral.com."
Contact the domain owner: If the domain name you want is registered but not in use, you can try contacting the domain owner to see if they're willing to sell it.
Consider a different blog niche: If none of the above options work, you can consider a different blog niche altogether. This might be a good opportunity to explore a new topic that you're passionate about