Why this product is the hard one
A line commits the provider to lend money later, to a business it can only assess today. Weak credit is read as a forward risk in a way it is not on a facility that is fully advanced at signing.
The facility is also revolving, so a provider that gets it wrong is exposed repeatedly rather than once.
That is why every other product on this site is more accessible with weak credit, and why the honest answer here is usually 'not yet' rather than 'try harder'.
The routes that do work
A secured line. Collateral — receivables, inventory, unencumbered equipment — lowers the credit bar substantially, because the provider has a claim if things go wrong.
A smaller starting limit. Providers will often write a modest facility to a weaker file and raise it on conduct, which is a genuine path rather than a consolation.
Revenue-based funding first. An advance or working capital loan has no score floor, and repaying one cleanly is the record that makes a line available in a year.
A business credit card, which is easier to obtain and starts building a business credit file.
What actually improves the answer
Twelve more months of trading and consistent deposits move a line application further than twenty points of score.
Banking conduct is read closely here. Eliminating negative days is the highest-leverage thing you can do in the six months before applying.
Clearing existing advances helps twice: it frees the capacity a line provider calculates against, and it removes the covenant conflict.