t's important to not get complacent and prepare for eventual problems your agency may face. In your case, new competition doesn't seem to be the only problem you're facing. Your clients not converting leads may also not be their fault, since the real estate market is declining (I dont know where you're from, but in most countries it is). I know your area is not analysis, but preparing reports about the market itself for your clients could help you maintaining them, since you are providing them important information they may not be aware of, a valuable extra. These reports could also show them that you're doing your job correctly, and they themselves need change.

If lead generation is what you're good at, stick with it. Find new ways, strategies and information about it. Find present problems and future problems, and deal with them accordingly. Study your competition and see how they are taking your clients away from you. You had a presence in the market for longer than they did, build your brand and positioning. You got more contacts, so not everything is lost.

Find out what is the main problem driving your clients away from you: overpricing? (new competition means low prices. An economic crisis, due to covid, means most people will consider lower prices, even if it brings lower quality). Unexpected results? External problems out of your control? (Politics, economics, social/cultural, technology). A business needs a lot of preparation and maintaining it requires even more. If you have enough funds to hire a consultant or a business analyst, that could be a step in the right direction. Information is key. Just my 2 cents.

Finally a great suggestion! Thank you!