1st, you can try Apify Scraper. Set a timing limit of 15-25 sec per result scraping; scrape only 16- 20 pages at one time. Then, after a few hours, you can try it again using a decentralized proxy location. Only scrape a limited number of leads at a time. like 200-250, it will maintain your LinkedIn account health.
2nd: You can use https://lix-it.com/ to scrape the sales navigator with emails. and without email. in free plan at once you can scrape 1k LinkedIn accounts.
If you need any help, you can dm me.