@Kayla Mcpherson working up the capital to keep buying is the primary limit for almost every investor. There are a couple of ways you can address this.
1. Focus acquisitions in growing areas that will appreciate rapidly. Make sure your property "matches" the neighborhood from the perspective of an appraiser (ie, buy the 3/2 sfh instead of an awkward triplex in a traditional bedroom community filled with 3/2 sfhs). This will help you to quickly access equity via HELOC or cash out (rates will impact which option is best). It's important to match your community so that there will be plenty of transactions to support your higher valuation.
2. Form partnerships, either as a GP or LP. GPs will be responsible for the bulk of the work required to make an investment work, LPs will be primarily responsible for only capital. Local meetups, BiggerPockets, FB groups, or sites dedicated to this concept (ie mogul.ooo) are all great places to find partnership opportunities. Prove your track record of success, find deals, analyze deals, and ultimately do all the work required to execute deals as a GP. Or make your capital available to GPs and fund smaller deals (since you mentioned being more limited on capital). Mogul is actually a concept where you can invest $100 or more into active deals. As an LP you'll be able to collect enough of a return to scale towards your next individual purchase on a fast track.