My assumption would be that your old crystals have already been dissolving, but slowly. Too slowly.
There’s no magic about 30 days. The ideal time between tests depends on what information is needed.
If you were doing well and both you and your doctor were confident no adjustment was needed, you might be tested less often. But you’re not doing well.
Blood tests are not the only source of information. When you say “for 2 months I haven’t been able to walk like a normal person”, that suggests something is not ideal.
If I understand well, your allopurinol dose has not changed for 2 months. That is a long time.
Maybe another doctor would have increased your dose without waiting for a test but if your doctor thinks more information is needed before acting, you need to get tested soon.
Getting your SUA to 5 or below until the symptoms go away sounds like a reasonable target.
I don’t think I’ve ever taken colchicine daily for more than 6 weeks. I doubt you’d be harmed by taking such a small dose a little longer but I really don’t know. Others have experienced side effects from prolonged use.
There are alternatives to colchicine if your body needs a break but as I mentionned, the alternatives are harmful in their own way. It’s a matter of balancing risks and I think you need an experienced doctor to do the balancing.
An alternative to taking colchicine every day is to take it as soon as you start feeling symptoms. But of course that’s not practical as long as you are suffering from constant symptoms.