The detours you encounter
If you search for "loan sole proprietorship BKR," you will find all kinds of alternatives. Let's be honest about what you will find there.
Alternative lenders look beyond your credit history. They assess your application based on your current business performance, cash flow, and revenue forecasts. Sounds good, but these parties compensate for their higher risk with higher interest rates. You pay a premium for your BKR history.
Crowdfunding and peer-to-peer lending allow you to present your business plan to potential investors. But this takes time and energy, and there is no guarantee of success. You are dependent on investors finding your story convincing.
Factoring is an option whereby you sell outstanding invoices to a factoring company. They advance the money and take over the collection. This is useful for cash flow, but it is not real financing for investments. And the costs add up.
Guarantors can offer a solution. This is someone with good creditworthiness who acts as a guarantor for your loan. But ask yourself: do you want to put a family member or friend in that position? And do you even have someone who can and is willing to do this?
Government schemes such as the BBMKB (SME Credit Guarantee Scheme) exist, but here too, your BKR registration still plays a role in the assessment.