Nothing is Permanent
Company goals in a startup often change. Your designs will need to pivot with them, to reflect the current objectives of the marketing or sales teams. Designs will always be modified in order to attract new users, increase sign ups and downloads, and so on, so don’t get attached. You might do ten or more variations of one email, landing page, one sheeter, or ebook design. There’s always room for improvement.
Similar to agency life everything seems to be due now. The main difference in a startup is that you are the only designer to make it happen. As the only designer you have to manage your own timelines & balance conflicting priorities. Be sure to ask stakeholders for their quarterly goals so you can plan ahead.
proceed with caution
Being the only designer means not having other designers to run your ideas by or do a design critique and get feedback. Find a group outside of work whom you can talk about design and share ideas. It’s important to stay surrounded by other designers who can provide you with honest feedback and whom you can learn from.
automate, delegate, eliminate
Since you are your own project manager ask yourself every day what can you automate, delegate or eliminate. Realistically, as the only designer, there won’t be much you can delegate. So, what can you automate and/or eliminate? Try to automate as much production work as possible and eliminate tasks that don’t help accomplish company goals.