At most clubs the money jobs land on one person, usually the same person doing three other jobs, and they get done in the gaps: a sponsor chased in April, a raffle run on a Saturday, a spreadsheet that only one household can open. It works right up until that person steps back.
The local builder who puts £400 into your club is not making a donation, whatever the conversation felt like. They are buying the fact that four hundred people in the area see their name every Saturday. Clubs that treat it as charity ask once a year and feel awkward doing it. Clubs that treat it as a small, cheap advertising slot can say exactly what the sponsor gets, and renew without the awkwardness.
The practical version of that: the sponsor's mark rides on the graphics you were posting anyway. A logo on the team sheet, the score card and the player of the match post is roughly thirty appearances across a season, each one seen by the people who live near their business. That is a far easier thing to sell than a name on a board nobody photographs.
Not because you will hold anyone to it, but because a list gives the conversation somewhere to go. Something like:
Price the low tiers so that a small business says yes in the pub without ringing anyone. Most grassroots sponsorship money is decided that fast.
“Raising money for the club” raises very little. “£1,200 for a new set of match balls and a scrum machine service, by the last home game in March” raises it, because people can see the finish line and know when they have helped enough. Give every fundraiser a target, a deadline and a page you can send in one link, then post the running total every week or two. The update posts do more work than the launch post.
Sponsor money in, fundraiser money in, kit fund out. One place, in the club's account rather than a personal one, with a line per transaction and a note saying what it was for. Boring is the point: the test of a club's books is whether a new treasurer can pick them up in an evening without ringing the old one.
Do it before the season ends, not after. Send the sponsor the season: how many posts carried their logo, the fixtures they backed, the thing their money paid for. A club that turns up in June with evidence renews at a much higher rate than one that turns up in August asking again, and it takes ten minutes if the ledger already knows the answers.
None of this is complicated. It is just easier to keep going when the sponsor plate, the donation page and the ledger are the same system as the team sheet, rather than three things one volunteer holds together out of goodwill.