Great question — answering as the UphillTech team:
DA is not a strong indicator of competitiveness. It's is not a reflection of actual authority Google assigns. Practice shows, best SEO results are achieved when people pay zero attention to DA, instead using less processed, but more raw metrics. But to answer your question: if DA is everything there is to those sites, then sure, you can compete using only DA :)
Full answer by BNazaruk: https://webmasters.stackexchange.com/a/137703 (CC BY-SA 4.0).
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