If you are 'bodaciously' loaded you can find a bazillion race teams that need an influx of 'working capital'. It's a matter of KNOWING the racing world and being able to pick the right team who will give you your monies worth in effort.
Even in a local race team effort, again, MONEY is the driving force. The more there is the better chance of succeeding. HOWEVER, your team members, management, EXPERIENCE of ALL involved, and and HEALTH of the class you want to race in, is VERY interconnected. You may have read about 'chemistry' in the crews being good or bad and detrimental to team success. Every single word is true.
There is absolutely ZERO chance of even being competitive without all the above mentioned being in place. THEN it can be SEVERAL seasons before THAT happens.