I have had a website on Webflow for about 2 months (link: Aello.io) which has some traffic as shown by GA4 (about 10 users per day).
I have a proper sitemap (automatic), robots.txt and submitted the page for indexing several times through verifying the property with a google ID and DNS property.
Neither google or bing has managed to index the page.
Assuming that’s all green-lights, you should actively promote it on other sites and services to increase its credibility, that will be essential for your long-game SEO.
In particular, because you’re playing with robots.txt, if you ever had the setting incorrect, and Google indexed those incorrect settings ( like Disallow: / ), then you have to find that setting in GSC and re-request Google specifically to recheck robots.txt.